CVE-2015-7871
Crypto-NAK packets in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to bypass authentication.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 81.8%, higher than 100% of all known CVEs. Patch or mitigate before the next change window.
Description
Crypto-NAK packets in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to bypass authentication.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 81.76% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-287
- Affected
- ntp/ntp · debian/debian linux · netapp/oncommand balance · netapp/oncommand performance manager · netapp/oncommand unified manager · netapp/clustered data ontap · netapp/data ontap
- Source
- cve@mitre.org
EPSS 81.8% since 4 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://support.ntp.org/bin/view/Main/NtpBug2941Vendor Advisory
- http://www.debian.org/security/2015/dsa-3388Third Party Advisory
- http://www.securityfocus.com/bid/77287Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1033951Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1274265Issue Tracking, Third Party Advisory, VDB Entry
- https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05270839Third Party Advisory, VDB Entry
- https://security.gentoo.org/glsa/201604-03Third Party Advisory, VDB Entry
- https://security.gentoo.org/glsa/201607-15Third Party Advisory, VDB Entry
- https://security.netapp.com/advisory/ntap-20171004-0001/Third Party Advisory
- http://support.ntp.org/bin/view/Main/NtpBug2941Vendor Advisory
- http://www.debian.org/security/2015/dsa-3388Third Party Advisory
- http://www.securityfocus.com/bid/77287Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1033951Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1274265Issue Tracking, Third Party Advisory, VDB Entry
- https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05270839Third Party Advisory, VDB Entry
- https://security.gentoo.org/glsa/201604-03Third Party Advisory, VDB Entry
- https://security.gentoo.org/glsa/201607-15Third Party Advisory, VDB Entry
- https://security.netapp.com/advisory/ntap-20171004-0001/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.